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        <a href="/6-20/homenav.html">Greenplum Database 6.20 Documentation</a>
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        <a href="/6-20/install_guide/install_guide.html">Installation Guide</a>
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            <a href="/6-20/install_guide/preinstall_concepts.html">Introduction to Greenplum</a>
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                <a href="/6-20/install_guide/preinstall_concepts.html#topic2">The Greenplum Coordinator</a>
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                <a href="/6-20/install_guide/preinstall_concepts.html#topic4">The Segments</a>
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                <a href="/6-20/install_guide/preinstall_concepts.html#topic9">The Interconnect</a>
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            <a href="/6-20/install_guide/capacity_planning.html">Estimating Storage Capacity</a>
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                <a href="/6-20/install_guide/capacity_planning.html#topic2">Calculating Usable Disk Capacity</a>
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                <a href="/6-20/install_guide/capacity_planning.html#topic3">Calculating User Data Size</a>
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                <a href="/6-20/install_guide/capacity_planning.html#topic4">Calculating Space Requirements for Metadata
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            <a href="/6-20/install_guide/prep_os.html">Configuring Your Systems</a>
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            <a href="/6-20/install_guide/install_gpdb.html">Installing the Greenplum Database Software</a>
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            <a href="/6-20/install_guide/verify_sw.html">Verifying a Greenplum Database Software Download</a>
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            <a href="/6-20/install_guide/create_data_dirs.html">Creating the Data Storage Areas</a>
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            <a href="/6-20/install_guide/init_gpdb.html">Initializing a Greenplum Database System</a>
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            <a href="/6-20/install_guide/data_sci_pkgs.html">Installing Optional Extensions</a>
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            <a href="/6-20/install_guide/upgrade_intro.html">Upgrading to Greenplum 6</a>
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                <a href="/6-20/install_guide/../pxf/pxf_upgrade_migration.html">PXF Upgrade and Migration</a>
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                <a href="/6-20/install_guide/migrate.html">Migrating Data from Greenplum 4.3 or 5 to Greenplum 6</a>
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            <a href="/6-20/install_guide/enable_iptables.html">Enabling iptables (Optional)</a>
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            <a href="/6-20/install_guide/apx_mgmt_utils.html">Installation Management Utilities</a>
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            <a href="/6-20/install_guide/env_var_ref.html">Greenplum Environment Variables</a>
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                <a href="/6-20/install_guide/env_var_ref.html#topic2">Required Environment Variables</a>
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                <a href="/6-20/install_guide/env_var_ref.html#topic7">Optional Environment Variables</a>
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            <a href="/6-20/install_guide/ansible-example.html">Example Ansible Playbook</a>
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